JPS632292Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a work spindle position adjustment device in a multi-axis grinding machine.

A two-axis grinder as shown in FIG. 1 has been developed by the present inventors.

This device includes a bed 1, a pair of feed tables 2 and 3 that are provided in parallel on the bed 1 and are driven by DC servo motors _M1 and _M2 .
Grinding wheel spindle devices 4 and 5 installed on each of these feed tables 2 and 3, and a rotating shaft that is rotatably installed on the bed 1 between each of the feed tables 2 and 3 and facing them. a shaft 6; a support frame 7 fixed on the pivot shaft 6 and perpendicular thereto; a pair of parallel work spindle devices 8, 8 fixed symmetrically to the lower portions of both sides of the support frame 7; A clamp device 9 is provided on one side of the support frame 7 and abuts against and clamps the side end of the frame 7 every time the pivot shaft 6 rotates 180 degrees; It is generally composed of a DC servo motor 10 for 180° reverse driving, and drive motors 11, 11 for the work spindle device 8.

In the case of such a device, the same workpiece W chucked at the tip of each workpiece spindle device 8, 8
The first machining is performed using the whetstones 12 and 13 of different shapes provided on the whetstone spindle devices 4 and 5 facing each other, and after the machining is completed, the rotation axis 6 is rotated.
By rotating the support frame 7 by 180 degrees, each workpiece W is made to face the respective grinding wheels 12 and 13 in a symmetrical position to the above, and at this stage, the same second grinding process is performed again. This is an attempt to improve machining speed by allowing one grinder to perform two processes on two workpieces at the same time.

By the way, in the currently commonly used grinding machines in which there is one grinding wheel spindle for one work spindle, the straightness of the grinding wheel axis and the work spindle cannot be uniquely and precisely determined only by their mutual positional relationship. It is easy to make fine adjustments to the position, and it can be easily done using an adjustment screw or the like provided in one place.

On the other hand, in the above-mentioned two-axis grinding machine, it is essential to accurately obtain straightness and position particularly at the reversal position in order to perform highly accurate machining.

However, in this case, compared to the conventional single-axis type, the part that holds the work spindle device 8 for each process is movable, so there may be backlash in the movable part or deflection of the grindstone shaft during grinding. Considering various factors, it is not necessarily easy to make fine adjustments, and since the adjustment factors involve various factors such as the distance from the rotation center axis and parallelism, it is difficult to grind the workpiece in a trial. It requires extremely troublesome effort to readjust while observing the condition.

This idea was devised in view of the above-mentioned problems, and in the above-mentioned multi-axis grinding machine, a pair of eccentric rings are attached to the front and rear outer periphery of the spindle frame of the work spindle device in a rotatable and fixed state. The outer periphery of each eccentric ring is in contact with the side surface of a reference block provided on the support frame, and by rotating the eccentric ring, a spindle corresponding to the amount of eccentricity is formed. The object of the present invention is to provide a position adjustment device that is capable of adjusting the position of the user, and the above configuration is designed to simplify the adjustment work as much as possible.

Hereinafter, an embodiment of the device according to the present invention applied to a work spindle device of a two-axis grinder shown in FIG. 1 will be described in detail with reference to the drawings.

2 and 3 show the support frame 7 in FIG.
and shows the vicinity of the work spindle device 8.

In each figure, each work spindle device 8 is
A main shaft spindle 20, which rotatably supports the spindle 20, and the support frame 7.
A pulley 22 pivotally attached to the rear end of the spindle 20 and the spindle 2 are attached to a spindle frame 21 whose four corners are fastened and fixed with bolts B.
0, and a diaphragm chuck 23 for chucking the work W at the tip of the pivot shaft 6.
Pulleys 24, 24 are respectively attached to double intermediate shafts (not shown) which rotate in conjunction with the drive motor 11 which is coaxially mounted at the center of the belt. By connecting the pulley 24 and the pulley 22 provided in each spindle device via 25, each spindle 20 can be rotated independently.

Further, a pair of eccentric rings 26, 26 are rotatably fitted to the front and rear outer peripheries of the spindle frame 21, respectively, and each eccentric ring 26 has a hollow screw or the like attached to the spindle frame 21, although not shown. It is designed to be fixed at any angular position on the outer periphery.

A total of four reference blocks 27 are fixed on both sides of the pivot shaft 6 facing each of these eccentric rings 26, and the outer circumference of each of the eccentric rings 26 is applied to the side surface of each of these reference blocks 27. The work spindle device 8 is positioned by this contact.

As shown in detail in FIG. 3, the clamping device 9 includes a fixed frame 30 erected on the table 1, and protrudes from the upper and lower parts of the fixed frame 30.
a pair of parallel clamp rods 31, 32 which are vertically slidably supported on the shaft; a piston rod 34 located on the rear side of the fixed frame 30 and which operates the clamp rods 31, 32 via flat links 33, 33; A pair of stopper blocks 36, 36 are provided at the front part of the fixed frame and project symmetrically in the vertical direction. The support frame 7 is positioned at a 180° rotation position by abutting the tips of the set screws 37, 37 which are screwed together through the upper and lower sides of the cylinder 35. When driven, the clamp rods 31 and 32 are lowered and raised, respectively, and the clamp blocks 31a and 32 provided at the tips of the rods are lowered and raised, respectively.
32a to the head 37a of the setting screw 37.
The support frame 7 is brought into contact with the stopper block 36 to position and clamp one side of the support frame 7.

Therefore, each work spindle device 8 is reversed to a position that is reversed from the position shown in each figure after one machining is completed by the grindstone spindle devices 4 and 5, and the same machining is performed again, but the reversed position The distance l between each spindle 20 and the center of the rotation axis 6 in must be exactly the same as before reversal, and it is also necessary to make fine adjustments to the position due to deflection of the grinding wheel shaft or differences in grinding conditions between the left and right grinding wheels. It is.

In this case, the bolts B of each spindle frame 21 are loosened, and the hollow screws of the eccentric rings 26 are loosened, and each eccentric ring 26 is rotated to rotate the spindle 20 relative to the reference block 27 according to the amount of eccentricity. Adjustment can be made by moving the axial center of the rotary shaft 6 toward or away from the axial center of the pivot shaft 6. In addition, when moving the eccentric rings 26 toward and away from each other parallel to the axis of the pivot shaft 6, each eccentric ring 26 should be brought into contact with the reference block 27 at the same eccentric position. What is necessary is to make the eccentric position different.

After making the fine adjustments in this way, fix the eccentric ring 26 and spindle frame 21 again.
After that, it is sufficient to fix the work W in the best position by performing the same operation while checking the grinding condition of the work W by trial.

As explained above, in the work spindle position adjusting device according to the present invention, the straightness of each work spindle with respect to the grinding wheel shaft is adjusted by the rotating operation of a pair of eccentric rings fitted to the front and rear outer peripheries of the spindle frame. Other fine adjustments can be made and the operations are relatively easy. Furthermore, in the present invention, the position of the work spindle is adjusted by rotating the two eccentric rings as described above, so by making the eccentric positions of the two eccentric rings different, only parallel movement with respect to the rotation axis is possible. This means that it can be easily moved diagonally. Therefore, it is possible to perform more fine position adjustment than when position adjustment is performed using one eccentric ring. Therefore, this invention has the advantage that trials can be easily carried out on a multi-axis grinding machine in which the work spindle is moved relative to each grinding wheel axis, and that the adjustment time can also be shortened.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the overall configuration of a two-axis grinder to which this invention is applied, Fig. 2 is an enlarged plan view showing the vicinity of the support frame and its work spindle device in Fig. 1, and Fig. 3 is 3-3 in Figure 2
FIG. 1... Bed, 4, 5... Grinding wheel spindle device, 6... Rotating shaft (transfer means), 7... Support frame, 8... Work spindle device, 21... Spindle frame, 26... Eccentric ring, 27...
...Reference block.

Claims (1)

[Claims for Utility Model Registration] A pair of grinding wheel spindle devices arranged on a bed at a distance from each other, and a shaft installed on the bed so as to be freely rotatable in the middle of the grinding wheel spindle devices and facing them. a pivot shaft, a support frame fixed on the pivot shaft perpendicular thereto, a pair of work spindles provided on both sides of the support frame to face the grindstone spindle device, and screwed to the support frame. Along with being
a spindle frame rotatably supporting the work spindle; a pair of eccentric rings rotatably fitted to the front and rear outer peripheries of the spindle frame; a reference block provided on both sides of the shaft; a clamping device located on one side of the support frame that abuts and clamps a side end of the support frame every time the pivot shaft rotates 180 degrees; A work spindle position adjustment device in a multi-axis grinding machine, characterized by comprising: